In this article we will discuss the exceptions of 2nd Law. 2nd law is divided into (i) single recessive epistasis (9:3:4), (ii) Duplicate recessive epistasis (9:7), (iii) Single dominant epistasis-cumulative effect of duplicate genes (9:6:1), (iv) Duplicate gene- one incomplete dominance (12:3:1), (v) Pleiotropism. To discuss about the topics we …
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